Methods for Estimating Modal Bandwidth Spectral Dependence

a spectral dependence and modal bandwidth technology, applied in the field of optical fibers, can solve the problems of increasing the cost of equipment required to perform the test, increasing the cost of fibers, increasing testing time, etc., and achieve the effect of effective modal bandwidth

Active Publication Date: 2021-09-23
PANDUIT
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  • Claims
  • Application Information

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Problems solved by technology

Due to the test complexity, it is time consuming and the equipment required to perform the test is expensive; EMB test requirements for multiple wavelengths will significantly increase testing time and consequently, increase fiber cost.

Method used

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  • Methods for Estimating Modal Bandwidth Spectral Dependence
  • Methods for Estimating Modal Bandwidth Spectral Dependence
  • Methods for Estimating Modal Bandwidth Spectral Dependence

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Embodiment Construction

[0032]The present invention discloses novel methods to estimate the EMB of a MMF at a desired wavelength, from measurements performed at another wavelength. The first method, Method 1, can be used to predict the EMB at an arbitrary wavelength, λS, based on an EMB measurement at a different wavelength, λM. The second method can be used to evaluate if the EMB at an arbitrary wavelength, λS, is equal of greater than a minimum specified threshold. Each method provides different degree of complexity and accuracy.

[0033]These methods can be used for the design and manufacturing processes of MMF that have a core and a cladding where the index of refraction of the cladding is less than that of the core. The core has a gradient index of refraction which varies from a peak value at the center of the core to a minimum value at the cladding interface following a predominant alpha-profile function to minimize modal dispersion [JLT 2012]. Refractive index profiles for two types of MMF are shown in...

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Abstract

Methods for estimating the Effective Modal Bandwidth (EMB) of laser optimized Multimode Fiber (MMF) at a specified wavelength, λS, based on the measured EMB at a first reference measurement wavelength, λM. In these methods the Differential Mode Delay (DMD) of a MMF is measured and the Effective Modal Bandwidth (EMB) is computed at a first measurement wavelength. By extracting signal features such as centroids, peak power, pulse widths, and skews, as described in this disclosure, the EMB can be estimated at a second specified wavelength with different degrees of accuracy. The first method estimates the EMB at the second specified wavelength based on measurements at the reference wavelength. The second method predicts if the EMB at the second specified wavelength is equal or greater than a specified bandwidth limit.

Description

CROSS REFERENCES TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. patent application Ser. No. 16 / 341,536, filed Apr. 12, 2019, which claims priority to International Patent Application Serial No. PCT / US2017 / 055307, filed Oct. 5, 2017 and U.S. Provisional Application No. 62 / 407,695, filed Oct. 13, 2016, the subject matter of which is hereby incorporated by reference in its entirety.BACKGROUND OF THE INVENTION[0002]The present invention relates in general to the field of optical fibers and more specifically, to multimode fibers (MMF) designed for operation at multiple wavelengths. The present invention also relates to the field of modeling, designing, production, sorting and testing of MMFs. More specifically it relates to the estimation of the MMF EMB at multiple wavelengths.[0003]The invention is also related to modal and chromatic dispersion compensation in Vertical Cavity Surface Emitting Laser (VCSEL) based MMF channels [1]. The methods described here can p...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B10/073H04B10/2581
CPCH04B10/0731H04B10/2581G01M11/338H04B10/07951
Inventor CASTRO, JOSE M.PIMPINELLA, RICHARD J.KOSE, BULENTLANE, BRETTHUANG, YUNOVICK, ASHER S.
Owner PANDUIT
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